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Which of the following processes permits the transformation of austenite to martensite, throughout the crosssection of a component without cracking or distortion? 
1. Austempering
2. Marquenching
3. Annealing
4. Tempering

1 Answer

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Best answer
Correct Answer - Option 2 : Marquenching

Explanation:

Marquenching or Stepped Quenching

  • Articles are first quenched in water to a temperature of 300-400°c and then quickly transferred to a less intensive medium like oil or air where they are held until they are completely cooled.
  • This method is widely used in the heat treatment of steel tools like taps, disc, milling cutter, etc.
  • A larger holding time will cause austenite decomposition. Austenite is transformed into martensite during the subsequent period of cooling to the room temperature.

Heat Treatment Processes

Advantages

 

           Austempering

  • Quenching cracks between core and surface do not develop.
  • Ductility is increased.
  • Impact strength and toughness are increased.

 

Annealing

  • To reduce hardness
  • To improve machinability
  • To refrain grain size
  • To relieve internal stresses

 

Tempering

  • Residual stresses are relieved
  • Ductility is improved
  • Toughness is increased

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